US drones have delivered a powerful blow in the Pakistani province North Waziristan, on the Afghan border, killing at least 20.
 
The attack aimed at several houses in the Dosali village where extremists had been hiding, in keeping with US intelligence reports.
 
According to the Untied States, North Waziristan insurgents help the Afghan Taliban militants in fighting the NATO troops in Afghanistan.
 
Pakistani authorities are opposed to missile and bomb attacks since these result in heavy civilian casualties.